Research Article
A Study of the Persistence of Mycobacterium bovis in the Environment under Natural Weather Conditions in Michigan, USA
Table 2
Duration of M. bovis persistence in the environment on corn, hay, water and soil samples in season “A”, “B” and “C”.
| | Days to last positive | Days to 1st negative after last positive | | Mean (standard deviation) | Maximum (days) | Mean (standard deviation) | Maximum (days) |
| | Fall/Winter “A” | | | | | | Corn | 24.00 (11.75) | 37.00 | 29.75 (13.94) | 43.00 | | Hay | 41.50 (3.00)* | 43.00 | 54.25 (7.5)* | 58.00 | | Soil | 21.75 (5.32) | 28.00 | 28.75 (6.18)* | 37.00 | | Water | 32.25 (18.23) | 58.00 | 38.50 (14.80) | 58.00 |
| | All samples | 29.88 (12.88) | 58.00 | 37.81 (14.59) | 58.00 |
| | Winter/Spring “B” | | | | | | Corn | 15.25 (7.89)* | 26.00 | 24.50 (12.12)* | 42.00 | | Hay | 26.00 (0.00) | 26.00 | 42.00 (0.00) | 42.00 | | Soil | 62.75 (30.63)* | 88.00 | 68.25 (23.41)* | 88.00 | | Water | 12.25 (10.50)* | 21.00 | 18.25 (9.39)* | 26.00 |
| | All samples | 29.06 (25.56) | 88.00 | 38.25 (23.61) | 88.00 |
| | Spring/Summer “C” | | | | | | Corn | 1.50 (1.73) | 3.00 | 7.00 (4.62) | 11.00 | | Hay | 0.00 (0.00) | 0.00 | 3.00 (0.00) | 3.00 | | Soil | 8.25 (5.50) | 11.00 | 15.75 (8.50) | 20.00 | | Water | 17.75 (22.01)* | 48.00 | 23.50 (22.05)* | 53.00 |
| | All samples | 6.88 (12.48) | 48.00 | 12.31 (13.53) | 53.00 |
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*Significant difference in means (ANOVA) among substrate type Bonfferoni .
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